These little wonders are nearly perfect cubes from the Navajun region in Spain. Mirror faces, perfect crystallography and an abundance of crystal sizes make the perennial classic. Most beginners to minerology or crystallography believe these are machine made because they are so perfect. You can actually see a reflection from these crystals. They can be single cubes or they can come in groups on a clay like matrix. This locality is unmatched for production of these perfect crystals.